OZONE ANALYZER BMT 964 Manual, Rev. 04/2021
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Overpressure
Cuvette pressure is above the allowed maximum pressure, which is also shown on the front panel
during warmup . The instrument displays
Err: Overpress
Due to the fact that reliable pressure data are not available, the displayed ozone concentration is
wrong. The Error Relay is in its error position.
Overrange
Ozone concentration is above the range of the instrument. An alternating display of
Err: Overrange
and ozone concentration range is shown. The Error Relay is set to error. The analog outputs are
on their maximum values.
EEPROMError
This error shows that there is something wrong with the internal non-volatile memory. Since this
memory stores important calibration data, the instrument should be thoroughly checked by BMT
MESSTECHNIK (s. also Chapter Troubleshooting). The Error Relay indicates an error.
11 Event- and Error-Log
These two logs are stored by the BMT 964 and document important events and errors. The last
48 events and the last 16 errors are stored, which means that the oldest entries are overwritten
when new entries are stored. Both logs are read out via the serial interface. For this purpose the
program BMT 964 Link or the Link-Mode command *49# respectively *50# can be used. Each
entry in these logs has a time stamp, which means that date and time are recorded with a resolu-
tion of 1s. The user is responsible for setting the internal clock. Life expectancy of the battery is
10 years or more. An empty battery will only result in erroneous time stamps in the logs.
The Error-Log documents all errors described in chapter Error Handling with date and time. The
above picture is a view of the Error-Log in the program BMT 964 Link.
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